ABSTRACT Oleic acid coated LaF3:Ce nanoparticles were synthesized and embedded in polyacrylamide through a two-step procedure. In the first step nanoparticles were synthesized by adopting co-precipitation technique and in the second step, nanoparticles were embedded in polyacrylamide (PAM) hydro-gel through the solution route. Nanoparticels were characterized for their crystal structure, particle size, organic coating and photoluminescence behavior using X-ray diffracttion, SEM, TEM, FTIR and photoluminescence spectroscopy. Size of nanoparticles was estimated using the Scherer formula. Polymer nano composite (PNC) material was synthesized with two different weight percent of the nano powder viz 1.634% (termed as NG1) and 0.1664% (termed as NG2). The nanoparticle-polymer composite exhibits emissions at 308 and 370 nm. A comparison of the emission spectrum of LaF3:Ce nano-powder pellet with that of the composite suggests a suppression of emission from the PAM host in the composite.
Cite this paper
T. Srinivasan, B. Venkatraman, D. Ponraju and A. Arora, "Photoluminescence Properties of LaF3:Ce Nanoparticles Embedded in Polyacrylamide," World Journal of Nano Science and Engineering, Vol. 2 No. 4, 2012, pp. 201-205. doi: 10.4236/wjnse.2012.24027.
 M.-Y. Xie, L. Yu, H. He and X.-F. Yu, “Synthesis of Highly Fluorescent LaF3:Ln 3+/LaF3 Core/Shell Nanoparticles by a Surfactant-Free Aqueous Solution Route,” Journal of Solid State Chemistry, Vol. 182, No. 3, 2009, pp. 597-601. Hdoi:10.1016/j.jssc.2008.12.011
 S. S. Mou, M. J. Islam and A. B. M. Ismail, “Photoluminescence Properties of LaF3-Coated Porous Silicon,” Materials Sciences and Applications, Vol. 2, No. 6, 2011, pp. 649-653.
 F. Wang, Y. Zhang, X. P. Fan and M. Q. Wang, “Facile Synthesis of Water-Soluble LaF3:Ln 3+ Nanparticles,” Journal of Materials Chemistry, Vol. 16, No. 11, 2006, pp. 1031-1034. Hdoi:10.1039/b518262j
 J. Stouwdam and F. van Veggel, “Near-Infrared Emission of Redispersible Er3+ , Nd3+ , and Ho3+ Doped LaF3 Nanoparticles,” Nano Letters, Vol. 2, No. 7, 2002, pp. 733-737.
 G. S. Yi and G. M. Chow, “Colloidal LaF3: Yb, Er, LaF3: Yb, Ho and LaF3: Yb, Tm Nanocrystals with Multicolor up Conversion Fluorescence,” Journal of Materials Chemistry, Vol. 15, No. 41, 2005, pp. 4460-4464.
 T. Kezuka, M. Konishi, T. Isobe and M. Senna, “Preparation and Properties of Nanocrystalline ZnS: Mn-Polymer Composite Silms,” Journal of Luminescence, Vol. 87, No. 89, 2000, pp. 418-420.
 A. Klausch, H. Althues, C. Schrage, P. Simon, A. Szatkowski, M. Bredol, D. Adame and S. Kaskel, “Preparation of Luminescent ZnS:Cu Nanoparticles for the Functionalization of Transparent Acrylate Polymers,” Journal of Luminescence, Vol. 130, No. 4, 2010, pp. 692-697.
 V. Kalima, I. Vartiainen, T. Saastamoinen, M. Suvanto, M. Kuittinen and T. T. Pakkanen, “UV-Curable ZnS/Polymer Nanocomposite for Replication of Micron and Submicron Features,” Optical Materials, Vol. 31, No. 10, 2009, pp. 1540-1546. Hdoi:10.1016/j.optmat.2009.03.003
 Y. Chen, X. Ji, Q. Sun, S. Jiang and B. Jiang, “A Novel Route for the Preparation of CdS Nanocrystal—Poly (Acrylic Acid) Composites Using γ-Radiation,” Journal of Non-Crystalline Solids, Vol. 311, No. 3, 2002, pp. 314- 317. Hdoi:10.1016/S0022-3093(02)01854-9
 T. K. Srinivasan, B. HVenkatraman, D.H HPonraju, M.H HKamarudinH and A. K. Arora, “Synthesis and Characterization of Surface Modified LaF3:Ce Nano Particles,” International Conference on HNanoscience, Engineering and Technology (ICONSET), Chennai, 28-30 November 2011,H pp. 528- 531. Hdoi:10.1109/ICONSET.2011.6168023
 N. Pewda, L. Mihut, I. Baltog, T. Velula and V. Teodorescu, “Optical Properties of Low-Dimensional PbI2 Particles Embedded in Polyacrylamide Matrix,” Journal of Optoelectronics and Advanced Materials, Vol. 8, No. 3, 2006, pp. 909-913.
 N. Q. Wu, L. Fu, M. Su, M. Aslam, K. C. Wong and V. P. Dravid, “Interaction of Fatty Acid Monolayers,” Nano Letters, Vol. 4, No. 2, 2004, pp. 383-386.
 J. S. Wang, J. Hu, D. H. Tang, X. H. Liu and Z. Zhen, “Oleic Acid Modified LaF3: Er, Yb Nanocrystals and Their Polymer Hybrid Materials for Potential Optical- Amplification Applications,” Journal of Materials Chemistry, Vol. 17, No. 16, 2007, pp.1597-1601.
 P. Dorenbos, “5D-Level Energies of Ce3+ and the Crystalline Environment. I. Fluoride Compounds,” Physical Review B, Vol. 62, No. 23, 2000, pp. 15640-15649.